|How can we decide if any particular measurement near zero is
actually zero or represents a true positive count?
There must be some level above which we can be confident, to a degree,
that a net count is valid. This is the critical limit, LC.
If we have a count, A, then when
the count is statistically significant
the count is not significant, where s0
is the standard deviation of the distribution and the factor ka
is selected so as to provide a predetermined degree of confidence
in the solution.
When ka corresponds to the
95% confidence level
where s is the standard deviance of
background estimate (counts).
Definition of critical limit, LC.
(The vertical axis represents the frequency of observing a particular